feat: list end customers in companies admin and improve dark/light mode contrast across all admin components

shop/lib/actions/companies.ts

@@ -52,3 +52,27 @@ export async function assignCompanyToUser(userId: string, companyId: string | nu
   revalidatePath('/admin/users')
   return true
 }
+
+export async function getEndCustomersByCompany(companyId: string) {
+  const admin = createAdminClient()
+  
+  // 1. Get all partners of this company
+  const { data: partners, error: partnersError } = await admin
+    .from('users')
+    .select('id')
+    .eq('company_id', companyId)
+  if (partnersError) throw partnersError
+
+  if (!partners || partners.length === 0) return []
+
+  const partnerIds = partners.map((p) => p.id)
+
+  // 2. Get all end customers belonging to these partners
+  const { data: customers, error: customersError } = await admin
+    .from('end_customers')
+    .select('*')
+    .in('partner_id', partnerIds)
+  if (customersError) throw customersError
+
+  return customers || []
+}